>> something just blew up. terror at the marathon. >> twin bombs rock the finish line of the boston marathon. >> it was horrible. >> the coordinated attack killing at least three people and injuring more than 140 others turning another american city into a target of terror. >> it's like a bomb explosion that we hear about in the news in baghdad. >> the attack prompting heightened security from coast to coast. >> any responsible groups will feel the full weight of justice. >> and also acts of kindness and heroism. >> we took care of the ones that we could and got them into the

ambulances as soon as possible. >> this is the "cbs morning news" for tuesday, april 16th, 2013. good morning. good to be with you. i'm anne-marie green. this morning it is still unclear who is responsible for the two bombs that exploded near the finish line of the boston marathon. at least three people were killed and one of the victims was an 8-year-old boy. more than 140 were injured. at least 17 of them are in critical condition. the first bomb exploded just before the finish line yesterday afternoon about ten seconds later another bomb went off about 100 yards away up the racecourse. the explosions unleashed bloody chaos and panic. runners and spectators were knocked to the ground. many in shock suffering shrapnel like injuries and away from the blast police stopped runners dead in their tracks before they could reach the bomb site.

susan mcginnis is in boston. susan, what is the latest? >> reporter: the people of boston are waking up to the aftermath of this horrific attack. we're standing about three blocks in front of exactly where that happened. police have cordoned off a three to five-block radius around the area where these two blasts went off. the fbi has taken over the investigation. the white house says these attacks are being treated as an act of terror. a pair of explosions at the finish line of the boston marathon. the bloody scene shocked many here in boston and around the world. >> you hear about things in other countries and other places and i guess in the united states we have to be aware that perhaps more of that will be coming our way. >> reporter: the investigation started almost immediately. officials cordoned off several blocks around the bomb site in order to allow bomb squad detectives to sweep the area for more explosive devices.

early tuesday morning we learned federal and local authorities are searching an apartment of someone they are calling a person of interest in the boston suburb. >> this is a very thorough and active and fluid ongoing investigation. >> reporter: police searched surveillance cameras in the area and cbs has learned that at least one piece of video shows a man carrying two backpacks who was in the area before the blast. president obama vowed to find those responsible for the bombing. >> any responsible individuals, any responsible groups will feel the full weight of justice. >> reporter: white house officials say they are treating the bombings as an act of terrorism. now, the city of boston is on high alert. very, very high alert around this city as it wakes up. new york city also area of high alert around subways and certain landmarks and sunday has the

london marathon coming up and as for the city of boston the governor here deval patrick said city of boston will operate today but it will not be business as usual. >> i don't expect that. susan mcginnis in boston. thank you. following the explosions in boston, security was tightened around the country. at the white house the secret service shut down access to pennsylvania avenue. patrol cars blocked entry points but the white house was not on lockdown and the park across the street remains open. in new york city, a police command truck was moved to times square. security was stepped up at landmarks like the empire state building and the world trade center and at prominent hotels. there's no claim of responsibility in the attack and no suspects in custody. earlier i spoke to cbs senior correspondent john miller about the investigation. you're a former assistant director for the fbi so you know what they're going through right now. take us through the process.

how do you investigate a massive crime scene with i would imagine a lot of small bits of evidence everywhere. >> so on a smaller level this is going to be the kind of investigation you saw for oklahoma city or 9/11 and i say on a smaller level because you have a smaller crime scene but you have a few advantages here which is there were a lot of witnesses right there when it happened. it was televised from a number of different angles and you were in the heart of downtown boston so you have a myriad of other cameras everything from the camera on the atm someone may have walked by to security cameras in the area and they are going over all of that. already they found video of an individual walking with two backpacks and that video shows him from behind. they'll exploit other angles to see if there is a front shot. was he carrying a backpack for one of the runners or a player

in this plot. >> i imagine with all of these images this is time consuming. you have seen people post ima images. it's going to take forever. >> they'll go through a lot of tape that's meaningless but that's now part of the process. we live in a world where we're surrounded by cameras. you have the boston joint terrorism task force which encompasses all of the federal and local agencies in boston. they will be the lead investigative piece here. you also have back at fbi headquarters the global resources of the fbi being managed from their command center. the strategic operation and information center. the director was down there for the bulk of date monitoring these events minute by minute, briefing the white house as things developed, and they were plugged into 16 other intelligence agencies. cia, dia, the entire alphabet soup and say run your leads

globally. was there something picked up on a wiretap or an intercept? a piece of coded e-mail that could relate to this and they'll be feeding all of that material back. >> that was senior correspondent john miller. steve silva is the senior sports editor for boston.com. he was shooting video at the finish line when the bombs went off and he spoke with scott pelley on last night's "cbs evening news." >> i was at the finish line about 2:50 p.m. getting runners coming across. folks running in the four-hour zone. there were 9,000 people still on the course. i was squared up right on the finish line and out of the blue there was a thud noise and smoke went up in the air. for a split second you thought is this some kind of a firework for a runner, famous runner coming across, a few photographers ran toward the area and as we're running probably under 20 seconds later

the second bomb went off up one block up so we knew it was serious. you could immediate see the carnage and people and pools of blood and cuts from the glass. the marathon sports building glass blew out of the front window and it was pure chaos as you can imagine. we already had medical folks in the medical tent treating marathon runners and now they're involved in a triage situation scrambling. saw one gentleman whose leg was severed off at the knee and there were more injuries after that. >> there was stunned silence after the blast and then 15 seconds later the second. what happened after that? >> scrambling. mass confusion. people didn't know what procedure was. the problem was people injured in the blast were on the other side of the partition to keep them off of the racecourse so everyone had to pull partitions away to get to the people and radio the people in the medical tent and then police came but you couldn't get outside help

because all of the roads were blocked off and sidewalks were thick with 10 to 15 people so people were running in every direction but didn't really know which direction to go. it was pure chaos. >> that was eyewitness steve silva of boston.com. coming up on the "cbs morning news," continuing coverage of the terror at a bth marathon. this is the "cbs morning news." means living with pain. it could also mean living with joint damage. humira, adalimumab, can help treat more than just the pain. for many adults, humira is clinically proven to help relieve pain and stop further joint damage. humira can lower your ability to fight infections, including tuberculosis. serious, sometimes fatal events, such as infections, lymphoma, or other types of cancer, have happened. blood, liver and nervous system problems, serious allergic reactions,

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house observing a moment of silence for the bombing victims in boston. majority leader harry reid said the senate will provide every available federal resource to bring those responsible to justice and speaker of the house john boehner called it a terrible day for all americans and adding to the tensions on the korean peninsula this morning, a u.s. marine helicopter made a hard landing in south korea. the chopper went down as it was trying to land just south of the demilitarized zone. a u.s. military spokesman says 21 marines were onboard and six are hospitalized. there are more than 28,000 troops stationed in south korea. three teenagers are scheduled to appear in court today in california. they're accused of sexually assaulting a classmate who later killed herself when photos of the alleged attack circulated in school. >> the sexual assault and death

of his 15-year-old daughter, audrie. >> now we must carry on and share her story so that this epidemic of sexual assault and cyberbullying amongst teens can be exposed and stopped. >> reporter: three teen boys were arrested at their school thursday and charged with sexually assaulting pott at a house party in saratoga, california. pott passed out after having too much to drink. the teens sexually assaulted her and photographed her and pictures were later e-mailed to classmates. just one week after the party, the 15 year old killed herself. her stepmother read some of her final messages posted on facebook. >> i am in hell. everybody knows about that night. the whole school is talking about it. my life is over. >> reporter: family members say the three boys were friends of potts but they are going after the teen suspects with a civil lawsuits and want them tried as

adults. >> if this can happen to my daughter, it can happen to anyone. >> reporter: the pott family wants this case to raise awareness about teenage bullying, harassment and sexual assault. >> there's a flaw that there's no consistency between the states. >> reporter: lawyers say the boys' actions did not provoke the suicide and insist they're innocent. a pile of negative economic reports led to a sell-off on wall street. the dow had its steepest decline of the year. also affected by the slowdown in the chinese economy and some profit taking after weeks of gains. blue chips lost 265 points yesterday. the nasdaq was also down losing more than 2% of its value. straight ahead, your tuesday morning weather. and security is stepped up at various events in the wake of the boston marathon bombing. [ female announcer ] the only patch for the treatment

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mild and dry from virginia to massachusetts and almost summertime in summer california. the stormy weather in parts of colorado was a late season snow day gift for students of all ages. the university of colorado as well as regional elementary schools called off classes yesterday and the new york mets had to postpone their outing with the rockies. the bombing at the boston marathon is prompting british police to review their security plans for sunday's london marathon. last year more than 37,000 runners took part in the race while thousands more were spectators along the course. the london marathon's chief executive contacted police to discuss security plans as soon as he heard the news from boston. security measures were heightened at last night's major league baseball games. los angeles police beefed up their presence at dodger stadium. a large crowd was on hand to mark the 66th anniversary of jackie robinson's breaking the baseball color barrier.

and boston celtics basketball schedule for tonight has been postponed. the national hockey league postponed last night's bruins game. the two teams play at boston's td bank garden which is two miles from where the bombings occurred. meanwhile, the boston red sox arrived in cleveland to start their series against the indians monday evening. the team had just wrapped up its annual patriots day game at fenway park when the attack happened. and a boston area athlete is being hailed as a hero for his actions in the wake of the bombing. this is former new england patriot joe andruzzi carrying a woman badly injured in the race. he organizes a team to race in the marathon every year. andruzzi has three brothers, firefighters that responded to the world trade center on 9/11. when we return, a recap of our top story. we'll take you back to boston for more on the deadly bombings at the marathon.

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here's a look at today's forecast in some cities around the country. washington, d.c. and atlanta in the 70s but rain in st. louis. denver, snowy mix. 36 the high in seattle 57 and rain. this morning there's no claim of responsibility and no motive for the bomb attack at yesterday's boston marathon. two bombs exploded within seconds of each other near the finish line. boston police say there was no specific warning. at least three people were killed and more than 140 were wounded. let's go back to boston now where susan mcginnis has the latest. good morning again, susan. >> reporter: good morning. here's the latest. we do know police have executed a search warrant at a home near here in a nearby suburb. the suburb is called revere. we understand they believe there may be some relation there to

these explosions. we heard there is one person possibly in custody but not officially called a suspect. this attack is being called very well planned. in addition to the two bombs that were detonated, two unexploded bombs were also found and were safely dismantled by authorities. so for now we do have an active crime scene right here. this is about three blocks behind me is where the two bombs went off at the finish line of the boston marathon. police are still involved in a very tedious search. every street, every gutter, every trash can, going through everything looking for more possible unexploded edevices. 140 people injured so far. the number is expected to go up as well. >> susan mcginnis in boston. thank you very much, susan. coming up on your local news on "cbs this morning," special coverage from the bombings.

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good morning. welcome to wusa9. today is tuesday, april 16. i'm andrea roane. i'm mike hydeck. thanks for joining us. we'll have an update on the boston marathon tragedy from yesterday. but first we'll start it off with monika with traffic coming up and mr. bernstein. pollen on my car, as you can

tell, is pretty thick. >> tree pollen came in high yesterday. everything else was low. things are increasing in the air. we have clouds around. the lack of sunshine, it will be helping a little bit, mike. we'll get into sunthis afternoon. spots of drizzle here and there. highs mid-70s. yesterday we only got to 63. the clouds really kept the lid on the temperatures from rising. your sunrise this morning at 6:30. we do have some showers and storms we're watching coming out of the midwest. that front will be bugging us by the middle of the week. one thing we're watching here, it's tough to see. you have this on shore flow bringing moisture and the clouds are banked up against the east side of the appalachians. it will take a while to burn off. we're hoping we can do it this afternoon. temps mid- to upper 50s. many areas 55 like la plata and manassas and hagerstown this morning. 54 gaitersburg. you can expect your afternoon temperatures if we get the sunshine in the mid- to upper

70s. that's a little bit above average for this time of year. monika samtani stepping in now. she has your timesaver traffic. good morning. good morning, howard and everybody. if you're planning to head around town, you're going to find generally speaking the roads are in good shape. we do have a couple of construction spots we're used to. canal road and 355 near cedar lane as well. let's take a live look outside first of all in maryland. here's what it looks like on the beltway. both loops are very, very quiet, basically leaving the 95 interchange. this is the outer loop past georgia avenue over to i-270. no issues on 270. live into virginia. these what it looks like 395 north of duke street heading into the downtown area. expect restricted access, especially around d.c. landmarks today. back to you guys. [ sirens

blowing ] make no mistake, we will get to the bottom of this. we'll find out who did this. we'll find out why they did this. any responsible individuals, any responsible groups will feel the full weight of justice. >> horrific scenes yesterday from the boston marathon. at least three people are dead, more than 140 injured after two explosions rocked the marathon. one of the nation's most prestigious road races. >> the white house is treating this attack as an act of terrorism. susan mcginnis is in boston. she has the latest on the investigation where authorities are focusing on one house. >> reporter: a pair of explosions at the finish line of the boston marathon. the bloody scene shocked many here in boston and around the world. >> you hear about things in other countries and other

places. i guess in the united states we have to be aware that perhaps more of that will be coming our way. >> reporter: the investigation started almost immediately. officials cordoned off several blocks around the bomb site in order to allow bomb squad detectives to sweep the area for more exclosessive devices. early tuesday morning, we learned federal and local authorities are searching an apartment of someone they're calling a person of interest in the boston suburb of revere. >> this is a very thundershower row and active -- very thorough and active investigation. >> reporter: police searched cameras in the area. cbs has learned at least one piece of video shows a man carrying for backpacks who was in the area before the blast. >> they're trying to sweep the other cameras in the area. that shot is only from the back. they want to see who that person is from the front and if he might be relevant. >> reporter: president obama vowed to find those responsible for the bombings. >> y